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Method for treating the surface of a metallic substrate

a technology of metallic substrates and surface treatments, applied in the direction of liquid/solution decomposition chemical coatings, coatings, transportation and packaging, etc., can solve the problems of disadvantages of such methods, the difficulty of adjusting the pot life, and the inability to control the coating process, etc., to achieve the effect of high and adjustable pot life and convenient handling

Active Publication Date: 2017-09-19
AMAG ROLLING GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The method provides a cost-effective, safe, and controllable process for large-area applications, resulting in a uniform, corrosion-resistant, and durable sol-gel coating with improved mechanical strength and adhesion, suitable for various processing methods and elevated temperatures.

Problems solved by technology

Handling such methods is disadvantageous, not least because of the use of the alcohols mentioned, since their boiling points are comparatively low.
Among other effects, this means that because of changes in concentration, the coating process becomes less controllable.
Accordingly, comparatively great technical effort and expense must be employed in order to be able to meet workplace-relevant regulations in terms of safety and health.
Nevertheless, such a method proves disadvantageous, since in the mixing of the starting compounds, a two-phase system first forms, which requires several hours to homogenize.
Moreover, alcohols with a low boiling point, which are formed in the course of the sol-gel process or are added as solvents, worsen the controllability of the method because of a constant change in the composition of the reaction mixture.
Furthermore, volatile alcohol vapors are potentially quite dangerous.

Method used

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  • Method for treating the surface of a metallic substrate
  • Method for treating the surface of a metallic substrate
  • Method for treating the surface of a metallic substrate

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Embodiment Construction

[0030]For coating according to the invention of a surface of an aluminum alloy, this surface is as a rule first degreased and / or pickled. Depending on the composition of the alloy of the metallic substrate, various means and mixtures of alkaline and acidic systems are available, for instance based on potassium hydroxide solution or sulfuric acid in combination with fluorides. In the exemplary embodiment, for alloys of the AA 7075 series, this is done by alkaline degreasing using potassium hydroxide solution and surfactants. Next, rinsing is done with deionized water, whereupon pickling is performed using a mixture of sulfuric and hydrofluoric acid. The degreasing or pickling can be done for instance by means of an immersion or spraying method (spray degreasing method or spray pickling method). After a further rinsing with deionized water, the metal sheet is dried. Hot air can suit the purpose, or other drying methods may be employed, for instance using nonwoven-covered rollers.

[0031...

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Abstract

An advantageous method for treating the surface of a metallic substrate made of aluminum or an aluminum alloy, comprising the following steps: providing a water-based mixture with a sol, comprising alkoxy silanes of general chemical formula Si(OR)4 and organoalkoxy silanes of general chemical formula R″Si(OR′)3, in which R and R′ are linear or branched, short-chained hydrocarbon groups with at least one hydroxyl group and R″ is an organic group with a glycidoxy-, merkapto-, amino-, methacryl-, allyl- and / or vinyl-group, applying the mixture to the surface of the metallic substrate and at least in sections, hardening the mixture with a formation of a sol-gel coating connected to the metallic substrate.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method for treating the surface of a metallic substrate of aluminum or an aluminum alloy.BACKGROUND OF THE INVENTION[0002]From the prior art, numerous methods for coating the surface of a metallic substrate are known. For this, various known precursors, typically organoalkoxysilanes, zirconium alkoxides, and organic acids acting as complexing agents in an alcohol solution, for instance of ethanol or isopropanol, are used. Handling such methods is disadvantageous, not least because of the use of the alcohols mentioned, since their boiling points are comparatively low. Among other effects, this means that because of changes in concentration, the coating process becomes less controllable. Accordingly, comparatively great technical effort and expense must be employed in order to be able to meet workplace-relevant regulations in terms of safety and health. To improve the method, U.S. Pat. No. 5,939,197 shows a method for surface trea...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C09D183/06B32B15/20B05D7/00B05D1/38C23C18/12
CPCC09D183/06B05D1/38B05D7/544B32B15/20C23C18/122B32B2255/06B32B2255/24Y10T428/31663
Inventor MELZER, CARSTENGROHMANN, TORSTENSCHUBERT, ULRICHMEYER, SARAH
Owner AMAG ROLLING GMBH
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